Confined Electron: Min Uncertainty in Momentum/Velocity

[sona1177]

Homework Statement

An electron is confined to a "quantum wire" of length 150 nm. what is the minimum uncertainty in the electron's momentum component along the length of the wire? What is the minimum uncertainty in the electron's velocity component along the length of the wire?

Homework Equations

(uncertainty in x coordinate of position)(uncertainty in x component of momentum) > or equal to 1/2pi

I used 150 x 10^-9 for change in x and solved but got 3.52 x 10^-28 but this is wrong

how do i do this? thanks

The Attempt at a Solution

 

[supratim1]

(uncertainty in x coordinate of position)(uncertainty in x component of momentum) > or equal to 1/2pi ?

isn't it h/2pi ?